Preheat oven to 350. Line a lightly greased cookie sheet (with sides) and cover completely with whole graham crackers. Fill in empty spaces with broken halves/quarters.Melt butter and sugar together and bring to a soft boil. Boil 2 minutes. Remove from heat and stir in nuts. Pour over crackers and spread thoroughly. Bake for 10 minutes. Cut while warm. After cutting (when just cool enough to touch), remove to wax paper and cool completely before putting in an air tight container.